Fix the build error:
  drivers/built-in.o: In function `twl_probe':
  drivers/mfd/twl-core.c:1256: undefined reference to `devm_regmap_init_i2c'
  make: *** [vmlinux] Error 1
Signed-off-by: liu chuansheng <chuansheng.liu@intel.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
[ Samuel is busy, taking it directly  - Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
        bool "Texas Instruments TWL4030/TWL5030/TWL6030/TPS659x0 Support"
        depends on I2C=y && GENERIC_HARDIRQS
        select IRQ_DOMAIN
+       select REGMAP_I2C
        help
          Say yes here if you have TWL4030 / TWL6030 family chip on your board.
          This core driver provides register access and IRQ handling